American vs dweller

American and dweller both are nouns.

Word	Noun	Adjective	Verb	Adverb
American	Yes	Yes	No	No
dweller	Yes	No	No	No

As nouns, dweller is a hypernym of American; that is, dweller is a word with a broader meaning than American:

Other hypernyms of American include denizen, habitant, indweller, inhabitant.

As nouns, dweller is a hypernym of American; that is, dweller is a word with a broader meaning than American:

American: a native or inhabitant of a North American or Central American or South American country
dweller: a person who inhabits a particular place

Other hypernyms of American include denizen, habitant, indweller, inhabitant.

American (noun)	dweller (noun)
the English language as used in the United States	a person who inhabits a particular place
a native or inhabitant of the United States
a native or inhabitant of a North American or Central American or South American country

American (adjective)	dweller (adjective)
of or relating to or characteristic of the continents and islands of the Americas
of or relating to the United States of America or its people or language or culture